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ernierod
September 4, 2012, 07:14 PM
Have a AR-10 Armalite-22" bbl-SS Bull bbl config.-1:8" twist.Am starting to develope accuracy loads for rifle using 139-142 gr bullets.I have the following powders-4064,4350,4831,RL19 and N150. Can anyone suggest a powder that I may try first to test for accuracy.Thanks for help.

Wyosmith
September 4, 2012, 07:24 PM
I would be interested in how well your rifle works. Has it been reliable? How often does it jam? (if ever?)

hodaka
September 4, 2012, 08:03 PM
My 700 in 260 likes both 4064 and 4350 although I tend to use 4350 more. I think you can work up loads for each.

I'd like to hear how you like the rifle. I've got an eye on the Armalite and DPMS in .260 and will get one when the wife isn't paying attention.

BTW- my 9 twist doesn't like 140's but shoots the 120's quite well.

bullspotter
September 4, 2012, 11:47 PM
I run the H4350 in my 260. AAA++ results with the 123 and 140 amax in a 1-8 twist.

LSnSC
September 5, 2012, 06:25 AM
Of the powders you've listed only IMR 4064 is recommended for gas operated rifles.
RL 19 amd IMR 4831 worked best im my 260 bolt gun with all bullet weights, but they are too slow to be optimal in gas guns.

hodaka
September 5, 2012, 08:19 AM
Why do you think 4350 is not suitable for an AR?

Understood about M1.

TimW77
September 5, 2012, 05:26 PM
"Of the powders you've listed only IMR 4064 is recommended for gas operated rifles.
RL 19 amd IMR 4831 worked best im my 260 bolt gun with all bullet weights, but they are too slow to be optimal in gas guns."

Since when have AR-15 and AR-10 "type" rifles had the same operating limitations as the M-1/M-1A/M-14?

You can't bend the op rod on an AR...

T.

LSnSC
September 7, 2012, 05:09 PM
Slow powders and they longer power curve can cause excessive port pressure resulting in battering of the BCG and broken components. An AR-10's BCG is heavy, get that weight moving faster than it was designed to move and something is gonna give.

Why would you think if it will bend an op rod, it wont beat the hell out of your BCG????

mnhntr
September 7, 2012, 06:54 PM
I use H4350 in my bolt .260, I would think Varget would be a good choice in a gas gun.

hodaka
September 7, 2012, 07:13 PM
I wouldn't think the comparison between the two operating systems is valid. I ran 4350 through my DPMS 308 for years and never saw any sign of wear. I think that you are wrong. I've also run a 6.8 with an 5.56 carbine gas system and carbine buffer for years without issues. The BCG design is pretty robust.

LSnSC
September 7, 2012, 08:29 PM
I run a 6.8 as well. The recoil impulse and reciprocating mass of the BCG is a fraction of the larger platforms. It was designed to operate in a carbine length system. Apple and oranges.

Think what you like, broken parts due to improper powder selection are a reality. Just because yours hasnt failed , doesnt mean it cant. May never fail, but why risk it?

RL 15, IMR 4895, H4895, IMR 4064, Varget all are fantastic 308 powders and have burn rates ideal for gas guns. One of those will give satisfactory results in a gas operated .260. Will it be as good as one of the slower powders suitable for bolt guns? Probably not.

TimW77
September 7, 2012, 11:12 PM
Because I don't rely on internet BS for my answers!:rolleyes:

I went to the manufacturer of my rifles and was told the powder limitations of the Garand type gas systems does NOT exist for AR type rifles.

So who do I believe? A self proclaimed expert or a REAL EXPERT in the engineering department of a major AR manufacturer?:D

Take your pick.

T.